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Question

What will be the direction of current in the coil A as the switch S is closed?



A
Clockwise
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B
Anticlockwise
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C
Anticlockwise and then clockwise
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D
Clockwise and then anticlockwise
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Solution

The correct option is A Clockwise
When switch S is closed, current flows in anticlockwise direction in the outer loop. This produces a flux acting out of the plane of the loop.Thus, magnetic field is increasing in the direction out of the plane.



To oppose this, there should be a flux acting into the plane of the loop. This flux is produced by the current induced in the inner loop. Thus, current induced in the inner loop should be clockwise.



This is the phenomenon of mutual induction.


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